CH-radical concentration measurements in fuel-rich CH{sub 4}/O{sub 2}/Ar and CH{sub 4}/O{sub 2}/NO/Ar mixtures behind shock waves
- Stanford Univ., CA (United States). Dept. of Mechanical Engineering
CH radicals are important precursors in prompt-NO formation and they also play a role in NO removal via reburning. Little information exists, however, on the absolute concentrations of CH during fuel-rich methane oxidation and their dependence on NO concentrations. Here the authors report results of CH-radical measurements for such conditions, using a shock tube in combination with a sensitive CH absorption diagnostic. These measurements provide useful data for the further development of large-scale reaction mechanisms, such as the recently developed Gas Research Institute methane oxidation and NO reburning mechanism (GRI-Mech 2.11). CH-radical profiles were measured at high temperatures for fuel-rich methane oxidation with and without addition of NO. Comparison of these data with predictions based on the GRI-Mech 2.11 mechanism shows significant deviations, suggesting the need for additional high-temperature rate data on important CH reactions and for further optimization of the detailed mechanism.
- OSTI ID:
- 619637
- Journal Information:
- Combustion and Flame, Vol. 113, Issue 4; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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